Add riscv binary recognition in gdb script

Signed-off-by: Xia Lifang <lifang_xia@linux.alibaba.com>
Signed-off-by: Mao Han <han_mao@linux.alibaba.com>
Change-Id: I61793c3c1e32828ac4196a20f85b4fe2832c4992

python-packages/gdbrunner/__init__.py

@@ -337,6 +337,9 @@ def get_binary_arch(binary_file):
     elif e_machine == 0x3E:
         assert ei_class == 2
         return "x86_64"
+    elif e_machine == 0xF3:
+        assert ei_class == 2
+        return "riscv64"
     else:
         raise RuntimeError("unknown architecture: 0x{:x}".format(e_machine))